I can almost guarantee that it's 99% exaggerated. Somebody claiming "eight hours" usually just means "two coins". I doubt they played nonstop for 8 hours straight. Some people might, sure, but not enough for a proper sample size. When people are upset they want to vent. That's half of what's happening here. Exotics were nerfed and were meant to be low in the first place - if the coins didn't cause you to get an exotic every hour, this response was pretty much guaranteed considering the general attitude towards the game atm.